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/* packet-maccontrol.c
* Routines for MAC Control ethernet header disassembly
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* 04/26/2010: WMeier: "Class-Based Flow Control [CBFC] Pause Frame" dissection added
* See: http://www.ieee802.org/1/files/public/docs2007/new-cm-barrass-pause-proposal.pdf
* 2014-04: David Miller <d.miller[at]cablelabs.com> and
* Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.com>
* + Added MPCP Gate, Report, and Register messages.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/etypes.h>
void proto_register_macctrl(void);
void proto_reg_handoff_macctrl(void);
static dissector_handle_t macctrl_handle;
static int proto_macctrl;
static int hf_macctrl_opcode;
static int hf_macctrl_timestamp;
static int hf_macctrl_pause_time;
static int hf_macctrl_cbfc_enbv;
static int hf_macctrl_cbfc_enbv_c0;
static int hf_macctrl_cbfc_enbv_c1;
static int hf_macctrl_cbfc_enbv_c2;
static int hf_macctrl_cbfc_enbv_c3;
static int hf_macctrl_cbfc_enbv_c4;
static int hf_macctrl_cbfc_enbv_c5;
static int hf_macctrl_cbfc_enbv_c6;
static int hf_macctrl_cbfc_enbv_c7;
static int hf_macctrl_cbfc_pause_time_c0;
static int hf_macctrl_cbfc_pause_time_c1;
static int hf_macctrl_cbfc_pause_time_c2;
static int hf_macctrl_cbfc_pause_time_c3;
static int hf_macctrl_cbfc_pause_time_c4;
static int hf_macctrl_cbfc_pause_time_c5;
static int hf_macctrl_cbfc_pause_time_c6;
static int hf_macctrl_cbfc_pause_time_c7;
static int hf_reg_flags;
static int hf_reg_req_grants;
static int hf_reg_grants;
static int hf_reg_port;
static int hf_reg_ack_port;
static int hf_reg_time;
static int hf_reg_ack_time;
static int ett_macctrl;
static int ett_macctrl_cbfc_enbv;
static int ett_macctrl_cbfc_pause_times;
static expert_field ei_macctrl_opcode;
static expert_field ei_macctrl_cbfc_enbv;
static expert_field ei_macctrl_dst_address;
static int * const macctrl_cbfc_enbv_list[] = {
&hf_macctrl_cbfc_enbv_c0,
&hf_macctrl_cbfc_enbv_c1,
&hf_macctrl_cbfc_enbv_c2,
&hf_macctrl_cbfc_enbv_c3,
&hf_macctrl_cbfc_enbv_c4,
&hf_macctrl_cbfc_enbv_c5,
&hf_macctrl_cbfc_enbv_c6,
&hf_macctrl_cbfc_enbv_c7,
NULL
};
static int * const macctrl_cbfc_pause_times_list[] = {
&hf_macctrl_cbfc_pause_time_c0,
&hf_macctrl_cbfc_pause_time_c1,
&hf_macctrl_cbfc_pause_time_c2,
&hf_macctrl_cbfc_pause_time_c3,
&hf_macctrl_cbfc_pause_time_c4,
&hf_macctrl_cbfc_pause_time_c5,
&hf_macctrl_cbfc_pause_time_c6,
&hf_macctrl_cbfc_pause_time_c7
};
#define MACCTRL_PAUSE 0x0001
#define MACCTRL_GATE 0x0002
#define MACCTRL_REPORT 0x0003
#define MACCTRL_REGISTER_REQ 0x0004
#define MACCTRL_REGISTER 0x0005
#define MACCTRL_REGISTER_ACK 0x0006
#define MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE 0x0101
static const value_string opcode_vals[] = {
{ MACCTRL_PAUSE, "Pause" },
{ MACCTRL_GATE, "Gate" },
{ MACCTRL_REPORT, "Report" },
{ MACCTRL_REGISTER_REQ, "Register Req" },
{ MACCTRL_REGISTER, "Register" },
{ MACCTRL_REGISTER_ACK, "Register Ack" },
{ MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE, "Class Based Flow Control [CBFC] Pause" },
{ 0, NULL }
};
static const value_string reg_flags_vals[] = {
{ 1, "Register" },
{ 2, "Deregister" },
{ 3, "Ack" },
{ 4, "Nack" },
{ 0, NULL }
};
static const uint8_t dst_addr[] = {0x01, 0x80, 0xC2, 0x00, 0x00, 0x01};
static const address macctrl_dst_address = ADDRESS_INIT(AT_ETHER, 6, dst_addr);
static int
dissect_macctrl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti, *opcode_item;
proto_tree *macctrl_tree = NULL;
proto_tree *pause_times_tree = NULL;
uint16_t opcode;
uint16_t pause_time;
int i;
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC CTRL");
col_clear(pinfo->cinfo, COL_INFO);
opcode = tvb_get_ntohs(tvb, 0);
ti = proto_tree_add_item(tree, proto_macctrl, tvb, 0, 46, ENC_NA);
macctrl_tree = proto_item_add_subtree(ti, ett_macctrl);
opcode_item = proto_tree_add_uint(macctrl_tree, hf_macctrl_opcode, tvb, offset, 2, opcode);
offset += 2;
if ((opcode >= MACCTRL_GATE) && (opcode <= MACCTRL_REGISTER_ACK)) {
proto_tree_add_item(macctrl_tree, hf_macctrl_timestamp, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(opcode, opcode_vals, "Unknown"));
switch (opcode) {
case MACCTRL_PAUSE:
if (!addresses_equal(&pinfo->dst, &macctrl_dst_address)) {
expert_add_info(pinfo, opcode_item, &ei_macctrl_dst_address);
}
pause_time = tvb_get_ntohs(tvb, offset);
col_append_fstr(pinfo->cinfo, COL_INFO, ": pause_time: %u quanta",
pause_time);
proto_tree_add_uint(macctrl_tree, hf_macctrl_pause_time, tvb, offset, 2,
pause_time);
break;
case MACCTRL_GATE:
break;
case MACCTRL_REPORT:
break;
case MACCTRL_REGISTER_REQ:
/* Flags */
proto_tree_add_item(macctrl_tree, hf_reg_flags, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
/* Pending Grants */
proto_tree_add_item(macctrl_tree, hf_reg_req_grants, tvb,
offset, 1, ENC_BIG_ENDIAN);
break;
case MACCTRL_REGISTER:
/* Assigned Port */
proto_tree_add_item(macctrl_tree, hf_reg_port, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Flags */
proto_tree_add_item(macctrl_tree, hf_reg_flags, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
/* Synch Time */
proto_tree_add_item(macctrl_tree, hf_reg_time, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Echoed Pending Grants */
proto_tree_add_item(macctrl_tree, hf_reg_grants, tvb,
offset, 1, ENC_BIG_ENDIAN);
break;
case MACCTRL_REGISTER_ACK:
/* Flags */
proto_tree_add_item(macctrl_tree, hf_reg_flags, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
/* Echoed Assigned Port */
proto_tree_add_item(macctrl_tree, hf_reg_ack_port, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Echoed Synch Time */
proto_tree_add_item(macctrl_tree, hf_reg_ack_time, tvb,
offset, 2, ENC_BIG_ENDIAN);
break;
case MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE:
if (!addresses_equal(&pinfo->dst, &macctrl_dst_address)) {
expert_add_info(pinfo, opcode_item, &ei_macctrl_dst_address);
}
ti = proto_tree_add_bitmask(macctrl_tree, tvb, offset, hf_macctrl_cbfc_enbv,
ett_macctrl_cbfc_enbv, macctrl_cbfc_enbv_list, ENC_BIG_ENDIAN);
if (tvb_get_uint8(tvb, offset) != 0) {
expert_add_info(pinfo, ti, &ei_macctrl_cbfc_enbv);
}
offset += 2;
pause_times_tree = proto_tree_add_subtree(macctrl_tree, tvb, offset, 8*2, ett_macctrl_cbfc_pause_times, NULL, "CBFC Class Pause Times");
for (i=0; i<8; i++) {
proto_tree_add_item(pause_times_tree, *macctrl_cbfc_pause_times_list[i], tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
}
break;
default:
expert_add_info(pinfo, opcode_item, &ei_macctrl_opcode);
break;
}
return tvb_captured_length(tvb);
}
void
proto_register_macctrl(void)
{
static hf_register_info hf[] = {
{ &hf_macctrl_opcode,
{ "Opcode", "macc.opcode", FT_UINT16, BASE_HEX,
VALS(opcode_vals), 0x0, "MAC Control Opcode", HFILL}},
{ &hf_macctrl_timestamp,
{ "Timestamp", "macc.timestamp", FT_UINT32, BASE_DEC,
NULL, 0x0, "MAC Control Timestamp", HFILL }},
{ &hf_macctrl_pause_time,
{ "pause_time", "macc.pause_time", FT_UINT16, BASE_DEC,
NULL, 0x0, "MAC control PAUSE frame pause_time", HFILL }},
{ &hf_macctrl_cbfc_enbv,
{ "CBFC Class Enable Vector", "macc.cbfc.enbv", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c0,
{ "C0", "macc.cbfc.enbv.c0", FT_BOOLEAN, 16,
NULL, 0x0001, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c1,
{ "C1", "macc.cbfc.enbv.c1", FT_BOOLEAN, 16,
NULL, 0x0002, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c2,
{ "C2", "macc.cbfc.enbv.c2", FT_BOOLEAN, 16,
NULL, 0x0004, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c3,
{ "C3", "macc.cbfc.enbv.c3", FT_BOOLEAN, 16,
NULL, 0x0008, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c4,
{ "C4", "macc.cbfc.enbv.c4", FT_BOOLEAN, 16,
NULL, 0x0010, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c5,
{ "C5", "macc.cbfc.enbv.c5", FT_BOOLEAN, 16,
NULL, 0x0020, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c6,
{ "C6", "macc.cbfc.enbv.c6", FT_BOOLEAN, 16,
NULL, 0x0040, NULL, HFILL }},
{ &hf_macctrl_cbfc_enbv_c7,
{ "C7", "macc.cbfc.enbv.c7", FT_BOOLEAN, 16,
NULL, 0x0080, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c0,
{ "C0", "macc.cbfc.pause_time.c0", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c1,
{ "C1", "macc.cbfc.pause_time.c1", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c2,
{ "C2", "macc.cbfc.pause_time.c2", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c3,
{ "C3", "macc.cbfc.pause_time.c3", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c4,
{ "C4", "macc.cbfc.pause_time.c4", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c5,
{ "C5", "macc.cbfc.pause_time.c5", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c6,
{ "C6", "macc.cbfc.pause_time.c6", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_macctrl_cbfc_pause_time_c7,
{ "C7", "macc.cbfc.pause_time.c7", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_flags,
{ "Flags", "macc.reg.flags", FT_UINT8, BASE_HEX,
VALS(reg_flags_vals), 0x0, NULL, HFILL }},
{ &hf_reg_req_grants,
{ "Pending Grants", "macc.regreq.grants", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_grants,
{ "Echoed Pending Grants", "macc.reg.grants", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_port,
{ "Assigned Port (LLID)", "macc.reg.assignedport", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_ack_port,
{ "Echoed Assigned Port (LLID)", "macc.regack.assignedport", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_time,
{ "Sync Time", "macc.reg.synctime", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_reg_ack_time,
{ "Echoed Sync Time", "macc.regack.synctime", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }}
};
static int *ett[] = {
&ett_macctrl,
&ett_macctrl_cbfc_enbv,
&ett_macctrl_cbfc_pause_times
};
static ei_register_info ei[] = {
{ &ei_macctrl_opcode, { "macc.opcode.unknown", PI_PROTOCOL, PI_WARN, "Unknown opcode", EXPFILL }},
{ &ei_macctrl_cbfc_enbv, { "macc.cbfc.enbv.not_zero", PI_PROTOCOL, PI_WARN, "8 MSbs of ENBV must be 0", EXPFILL }},
{ &ei_macctrl_dst_address, { "macc.dst_address_invalid", PI_PROTOCOL, PI_WARN, "Destination address must be 01-80-C2-00-00-01", EXPFILL }},
};
expert_module_t* expert_macctrl;
proto_macctrl = proto_register_protocol("MAC Control", "MACC", "macc");
proto_register_field_array(proto_macctrl, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_macctrl = expert_register_protocol(proto_macctrl);
expert_register_field_array(expert_macctrl, ei, array_length(ei));
macctrl_handle = register_dissector("macc", dissect_macctrl, proto_macctrl);
}
void
proto_reg_handoff_macctrl(void)
{
dissector_add_uint("ethertype", ETHERTYPE_MAC_CONTROL, macctrl_handle);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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